Clock



FIG. 1 is a front, right and top perspective view of the clock design according to the invention;

FIG. 2 is a front elevational view of the clock design;

FIG. 3 is a bottom plan view of the clock design (the top view is a mirror image of FIG. 3);

FIG. 4 is a left-side elevational view of the clock design (the right-side view is a mirror image of FIG. 4); and,

FIG. 5 is a rear elevational view of the clock design. 

The ornamental design for a clock, as shown and described. 